The New York Times reports: The federal government has significantly expanded undercover operations in recent years, with officers from at least 40 agencies posing as business people, welfare recipients, political protesters and even doctors or ministers to ferret out wrongdoing, records and interviews show.

At the Supreme Court, small teams of undercover officers dress as students at large demonstrations outside the courthouse and join the protests to look for suspicious activity, according to officials familiar with the practice.

At the Internal Revenue Service, dozens of undercover agents chase suspected tax evaders worldwide, by posing as tax preparers, accountants drug dealers or yacht buyers and more, court records show.

At the Agriculture Department, more than 100 undercover agents pose as food stamp recipients at thousands of neighborhood stores to spot suspicious vendors and fraud, officials said.

Undercover work, inherently invasive and sometimes dangerous, was once largely the domain of the F.B.I. and a few other law enforcement agencies at the federal level. But outside public view, changes in policies and tactics over the last decade have resulted in undercover teams run by agencies in virtually every corner of the federal government, according to officials, former agents and documents. [Continue reading…]